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.dahe{ width:720px; margin:0 auto;}
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 .t2{ width:200px; height:500px; background:#CCC; float:left; margin-right:10px;}
 .t3{ width:300px; height:500px; background:#33C; float:left; margin-right:10px;}
 .t4{ width:200px; height:500px; background:#339; float:left;}
 .t5{ width:720px; height:100px; background:#F0F; float:left; margin-top:10px;}
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